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st: Dropped values in simultaneous equations


From   mmolina@uniroma3.it
To   statalist@hsphsun2.harvard.edu
Subject   st: Dropped values in simultaneous equations
Date   Tue, 10 Mar 2009 20:14:51 +0100 (CET)

Dear statalist,
Working with one of my samples (that should be very similar to the others,
only changing the country, and not having problems with the others) I
obtained dropped values for this particular situation.
I read on the FAQ this:

Why do estimation commands sometimes drop variables?
Title    Estimation commands and dropped variables
Author  James Hardin, StataCorp
Date  August 1996; minor revision July 2005

--------------------------------------------------------------------------------

When you run a regression (or other estimation command) and the estimation
routine drops a variable, it does so because of a dependency among the
independent variables in the proposed model. You can identify this
dependency by running a regression where you specify the dropped variable
as the dependent variable and the remaining variables as the independent
variables.

Is it valid also for simultaneous equations?
What should I do?
Thanks and regards,
Alejandra Molina

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